Why would I have 3/16" axial end play in my crankshaft.

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This problem was uncovered due to the rear crank seal leeking. Once the timing belt and timing belt drive were removed I found the seal had been driven out of its seat an 1/8". I could move the crank shaft axially about 3/16", nothing radially. I then pulled out the oil pump and could see that the crank shaft had been rubbing on the oil pump housing. I then removed the oil pan and can see the starter ring gear is rubbing on the front of the engine block. Is there some spacer bushing that was not installed, I can't see anything in parts book. Why would the crank shaft move this much axially?